Air compressor



FIG. 1 is a perspective view taken from the top, front and left side of an air compressor embodying my new design;

FIG. 2 is a perspective view taken from the top, front and right side thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevational view thereof; and,

FIG. 8 is a rear elevational view thereof.

The broken line representations of other components which might be used with my new design are for the purpose of illustration only and form no part of the claimed design. 

The ornamental design for an air compressor, as shown and described. 